In geophysical data inversion of metallic ore deposits, the automatic inversion of data retrieval models often appears to be inconsistent with the objective of geological phenomena. However, the depth, shape, size, range and other changes in the physical properties of the inversion model with known constraints can restrict the inversion model, so that the inversion of geoelectric model can become more realistic. In this paper, with the application of the controlled source audio magnetotelluric survey (CSAMT) in a porphyry copper deposit of Guangxi as an example, the authors, taking into account the validity of the CSAMT method, the resolution and physical properties of rocks and minerals and the deposit characteristics and other factors, utilized the shallow known orebodies and wall rocks to perform inversion of profiling geoelectric model and made positioning and forecasting of deep orebodies. Drilling verification shows that remarkable ore-prospecting results have been achieved.